Tapering Off

I finished a cycle of P-Plex just after Christmas, and have since experienced about a 10% decrease in general strength (though my deadlift continues to go up). My weight and measurements remain the same, however.

I'm going to train naturally for at least the next six months, and want to bring my bench and squat up. Neither are easy for me, however, since I have long limbs.

What would be a recommended program or rep/weight scheme? My body tends to respond to higher reps (ectomorphic body type), though I'm eager to get my numbers up, esp. squat (it's really bad, but my range of motion is ridiculous). I've been training a while, but still haven't gotten a totally solid idea of what's best for my body.